Warp machine



P. SCHNFELD wARP lMACHINE Aug. 26, 1941.

Filed June 14, 1940 Patented Aug. 26, 1941 WARP MACHINE Paul Schnfeld,Chemnitz, Germany Application June 14, 1940, Serial No. 340,427 InGermany May 13, 1938 v2 Claims.

This invention relates to warp machines, and particularly to a drive forthe warp beam thereof It is known to provide warp machines with a warpbeam drive substantially comprising a selflocking driving device thatcan be started and stopped by .a clutch coupling and a warp tensionroller which is moved by the warp and, by con- 1 trolling the couplingin dependence upon the consumption of the warp, starts or stops theself- 'locking driving device.

ment of the coupling and the Starting of the drop in tension in elasticwarps.

self-locking driving device for the beam. Each starting of the beamdriving device presupposes therefore an increase in warp tension, andthis increased tension, immaterial when non-yielding and inelastic goodsare concerned, has serious results in case of, say, rubber warps,because it means irregular working and the production of unsightly andeven useless fabrics.

According to the invention, this trouble is overcome by controlling thecoupling by aweighted roller loosely disposed in a sag' of the rubberwarp and lifting a feeler after reaching a predeter mined positionwhereby engagement of the coupling is effected.v

Although the warp tension roller of a 4drive according to the inventionisalso moved into operative position by the warp during the consumptionthereof, this is done without requiring an increase in warp tension,since the roller is loosely suspended in a sag of the warp. The termtension roller kis retained only because the roller serves for impartingto the warp the necessary initial tension and equalizing the stressingof the various threads. The feeler acted upon by the roller in thepredetermined position to throw in the coupling does not require forlifting anv expenditure of energy involving increased. Warp tension, sothat the drive according to the invention is actuated completelyindependently of the warp tension.

It is not new of course in the art to loosely arrange a tension rollerin a sagof the warp and to use the roller for controlling the beamdrive.

The known constructions lack, however, a selflocking beam drive as wellas a. coupling for starting and stopping the drive, and there is,moreover, no feeler, since the tension roller itself by its own weightacts as beam drive'. The beam simply has a brake or pawi-controlledlocking mechanism which is rendered inoperative when the roller hasreached a certain elevated position so as to permit free motion of thebeam and its rotation by the roller descending by its own weight to aposition at which it releases again the brake or other locking mechanismfor stopping the beam. The unavoidably sudden release of the brake orother mechanism causes too rapid motion of thel beam and bringsabont anabrupt Inversely, restarting of the beam involves a temporary increasein tension, so that this known beam drive is not suited for elasticwarps. l

The invention is illustrated by way of example in the accompanyingdrawing, in which Figure l is a side view of.a beam for rubber warpswith a tension roller arranged in a sag of the warp and a feelerdisposed in the roller path;

Fig. 2 shows the equipment of the beam with a self-locking drivingdevice and a coupling associated therewith; and

Fig. 3 shows on an enlarged scale the control of the coupling.

The warp beam 2 for the-rubber warp I is fitted with a self-lockingdriving device comprising a worm I6 on a shaft I4 anda worm wheel I5 onthe beam shaft. The shaft I4 receives its m0- tion from a shaft 8 bymeans of a chain I2 and two sprockets II, I3. The self-locking drivingdevice I5, I6 can be started and stopped by a coupling 6, 1, the member1 thereof being loosely positioned on the shaft 8 and secured againstaxial displacement whilst the clutch member 6 is arranged thereon so asto be axially displaceable but non-rotatable. The clutch member 6 isprovided with a sprocket 9 and can be rotated by means of a. chain I0 torotate the shaft 8. A spring I1 keeps the two members 6, 1 forming aknown pin coupling apart.V The coupling 6, 1 is controlled by a tensionroller 3 which is moved up and down in dependence upon the consumptionof the warp in a sag of the latter and whose weight may be varied byweights 4. In the path of the roller 3 a feeler 5 is positioned andlifted by the roller 3 at a predetermined position to throw in thecoupling 6, 1. As shown in Figs. 1, 3, the feeler 5 comprises a bardisposed on a rocking shaft I9 provided with a cam I8 and a. roll 2liwhich abuts against the side oi the coupling member 8, the arrangementbeing such that lifting of the feeler 5 by the roller 3 causes the camI8 or its roll 20 to push the movable coupling member .6 into closingposition.

The invention is not restricted to the const-ructionshown and described,since it is obvious that various changes can be made in the form of thecoupling controlling the self-locking driving device as Well as in thedevice itself and with respect tothe feeler and the Way it acts upon thecoupling without departing from the scope thereof.

I claim:

1. A warp beam drive in warp machines, comprising a Warp beam equippedwith an elastic warp, a beam shaft, a self-locking driving deviceincluding a shaft a Worm disposed on said shaft and a worm wheel on thebeam shaft, means for driving said shaft. a coupling arranged on saidshaft driving means and having a movable member for starting andstopping the beam drive, a

I comprising a rocking shaft supporting the feeler and a cam with rolldisposed on said shaft, said roll contacting with the movable member ofthe coupling and pushing it into closing position when said feeler islifted by said tension roller.

PAUL SCHNFELD.

